From: Kenneth Johansson <kenneth.johansson@etx.ericsson.se>
To: "Jörn Engel" <joern@wohnheim.fh-wedel.de>
Cc: "Jarkko Lavinen \(NMP/Helsinki\)" <jarkko.lavinen@nokia.com>
Cc: David Woodhouse <dwmw2@infradead.org>
Cc: MTD List <linux-mtd@lists.infradead.org>
Subject: Re: JFFS2 mount time
Date: Tue, 13 Jan 2004 18:40:09 +0100 [thread overview]
Message-ID: <1074015609.9220.35.camel@spawn.uab.ericsson.se> (raw)
In-Reply-To: <20040113172920.GB25159@wohnheim.fh-wedel.de>
On Tue, 2004-01-13 at 18:29, Jörn Engel wrote:
> On Tue, 13 January 2004 17:21:15 +0100, Kenneth Johansson wrote:
> >
> > hmm I reread the firt post why is read so slow?? When I thought about
> > using nand I read that reading a byte took something like 50 ns. That is
> > like 20MB per second for an 8 bit device. This is in the region where it
> > did not pay to be smart,the accesses overhead to do read only what's
> > needed is greater than the time wasted reading uneccessary data.
>
> But on nand it is not only possible, but also likely that flash size
> is greater than ram size. Does your approach still work then?
>
> Jörn
Obviously no. But maybe it's still cheaper to do the work in big chunks
I don't know you need to actually do a test to see what happens. It's
not so easy to see in advance what will happen. I thought for sure that
it would be faster to only read what was needed but it was not, at least
not on a 200 MHz ppc if you have an P4 3GHz the picture is quite
different.
next prev parent reply other threads:[~2004-01-13 17:42 UTC|newest]
Thread overview: 82+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-01-13 12:50 JFFS2 mount time Jarkko Lavinen (NMP/Helsinki)
2004-01-13 13:19 ` Joakim Tjernlund
2004-01-13 13:39 ` David Woodhouse
2004-01-13 15:25 ` Kenneth Johansson
2004-01-13 15:30 ` David Woodhouse
2004-01-13 16:21 ` Kenneth Johansson
2004-01-13 17:29 ` Jörn Engel
2004-01-13 17:40 ` Kenneth Johansson [this message]
2004-01-13 18:43 ` Jörn Engel
2005-01-04 15:00 ` Steven Scholz
2005-01-05 10:45 ` Artem B. Bityuckiy
2005-01-05 11:10 ` Ferenc Havasi
2005-01-05 11:24 ` Steven Scholz
2005-01-05 11:45 ` Artem B. Bityuckiy
2005-01-06 10:50 ` Ferenc Havasi
2005-01-10 15:14 ` Steven Scholz
2005-01-10 15:25 ` Steven Scholz
2005-01-11 8:26 ` Ferenc Havasi
2005-01-11 8:34 ` Steven Scholz
-- strict thread matches above, loose matches on Subject: below --
2004-10-20 14:26 Ferenc Havasi
2004-10-20 15:26 ` [OBORONA-SPAM] " Artem B. Bityuckiy
2004-10-20 15:49 ` Ferenc Havasi
2004-10-20 15:53 ` Artem B. Bityuckiy
2004-10-21 6:29 ` Artem B. Bityuckiy
2004-10-21 6:54 ` Ferenc Havasi
2004-10-21 7:16 ` Artem B. Bityuckiy
2004-10-21 19:50 ` Ferenc Havasi
2004-10-21 12:49 ` Jarkko Lavinen
2004-10-21 19:11 ` Ferenc Havasi
2004-10-22 9:58 ` Ferenc Havasi
2004-10-21 13:24 ` David Woodhouse
2004-10-21 20:05 ` Ferenc Havasi
2004-10-22 12:44 ` Artem Bityuckiy
2004-10-25 9:36 ` Ferenc Havasi
2004-10-25 10:56 ` Artem Bityuckiy
2004-10-25 15:30 ` Ferenc Havasi
2004-10-26 9:59 ` Artem Bityuckiy
2004-10-26 10:21 ` Ferenc Havasi
2004-10-26 11:05 ` Artem Bityuckiy
2004-10-26 13:52 ` Ferenc Havasi
2004-10-25 11:21 ` Artem Bityuckiy
2004-10-26 9:29 ` Jarkko Lavinen
2004-10-26 10:24 ` Ferenc Havasi
2004-10-26 10:34 ` Artem Bityuckiy
2004-12-15 23:19 Gareth Bult (Encryptec)
2004-12-16 0:15 ` Josh Boyer
2004-12-16 1:02 ` Gareth Bult (Encryptec)
2004-12-16 12:53 ` Josh Boyer
2004-12-16 21:22 ` Gareth Bult (Encryptec)
2004-12-16 21:28 ` Josh Boyer
2004-12-16 21:47 ` Gareth Bult (Encryptec)
2004-12-17 12:54 ` Josh Boyer
2004-12-17 15:33 ` Gareth Bult (Encryptec)
2004-12-17 16:02 ` Josh Boyer
2004-12-17 16:46 ` Gareth Bult (Encryptec)
2004-12-17 17:08 ` Artem B. Bityuckiy
2004-12-17 17:10 ` Josh Boyer
2004-12-17 17:26 ` Gareth Bult (Encryptec)
2004-12-17 17:35 ` Josh Boyer
2004-12-17 18:09 ` Gareth Bult (Encryptec)
2004-12-17 19:14 ` jasmine
2004-12-17 20:55 ` Gareth Bult (Encryptec)
2004-12-18 16:02 ` Jörn Engel
2004-12-20 16:34 ` Josh Boyer
2004-12-20 17:12 ` Gareth Bult (Encryptec)
2004-12-21 13:09 ` Jörn Engel
2004-12-21 13:24 ` Gareth Bult (Encryptec)
2004-12-21 13:34 ` Jörn Engel
2004-12-18 16:19 ` Jörn Engel
2004-12-18 17:32 ` Gareth Bult (Encryptec)
2004-12-18 17:52 ` Jörn Engel
2004-12-18 18:11 ` Jörn Engel
2004-12-18 20:48 ` Gareth Bult (Encryptec)
2004-12-19 2:44 ` Jörn Engel
2004-12-21 13:30 ` Jörn Engel
2004-12-21 13:40 ` Gareth Bult (Encryptec)
2004-12-21 15:00 ` David Woodhouse
[not found] ` <1103644945.10792.175.camel@squizzey.bult.co.uk>
2004-12-21 16:04 ` Jörn Engel
2004-12-16 13:43 ` Ferenc Havasi
2004-12-20 16:01 ` Gareth Bult (Encryptec)
2004-12-20 16:09 ` Ferenc Havasi
2004-12-20 16:39 ` Gareth Bult (Encryptec)
2004-12-20 17:48 ` Gareth Bult (Encryptec)
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